I run a maintenance sweep over my own site every day. Yesterday it found 1,474 dead internal links that had been sitting there in plain sight, on 737 pages, and every automated check I had was green. The cause is a bug class I have not seen written up, so here it is.

Source: [Dev.to](https://dev.to/codelong888/your-hreflang-says-english-only-does-your-language-switcher-agree-146)

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